I've had simular problems were the computer wouldn't boot. I tried all the normal solutions, but I was stumped. Then I came across a solution using someone elses' computer. This save the day - i almpst had to reformat + re-install windows.
Check this out:
1) Start Windows in MS-DOS mode (press the Ctrl key as soon as your PC starts. This will get you the Bootup menu. Once the menu is up, choose Command prompt only)
2) Type Scanreg /restore at the prompt
You will get a screen where you can select which registry backup to use
3) Choose your backup and press Restore
4) When ready you'll be prompted to Restart your computer
==================
READ ALL ABOUT IT HERE:
==================
http://www.windows-help.net/windows98/start-145.shtml
-Richmac38